Process for dyeing high-molecular organic material, and novel polycyclic pigments
AssigneeCiba-Geigy Corporation
InventorsAbul Iqbal, Luigi Cassar
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Abstract
A process for dyeing high-molecular organic material in the bulk characterized by the use of a 1,4-diketo-pyrrolo[3,4-c]-pyrrole of the formula ##STR1## wherein R.sub.1 and R.sub.2 are isocyclic or heterocyclic aromatic radicals, preferably unsubstituted or substituted phenyl or naphthyl radicals. The dyeings obtained, for example in plastics, fibres, lacquers and printings, are distinguished by very high coloring strength, high saturation, good dispersibility, good fastness to cross-lacquering, migration, heat, light and weather, and also by a high gloss and a good IR-remission behavior.
Claims11
A process for dyeing high-molecular weight organic material in the bulk of which comprises
- incorporating therein a 1,4-diketo-pyrrolo[3,4-c]pyrrole of formula I ##STR15## wherein R.sub.1 and R.sub.2 are isocyclic or heterocyclic aromatic radicals.
A high-molecular weight organic material dyed in the bulk by having incorporated therein a 1,4-diketo-pyrrolo[3,4-c]pyrrole of formula I ##STR16## wherein R.sub.1 and R.sub.2 are isocyclic or heterocyclic aromatic radicals.
Dependencies are inferred from the claim text.